/*
    bisec.c
 */
#include <stdio.h>

double f(double x)
//  f(x) = x^2 - 2
{
    return _____?_____;
}

int main(void)
{
    int n = 0;
    double x1, x2, x3, err;
    double eps = 1.0e-6;

    x1 = _?_;
    x2 = _?_;
    printf("# n, x, err\n");
    do {
        n++;
        x3 = _______?_______;
        if (_____?_____) ___?___;
        else             ___?___;
        err = ___?___;
        printf("%4d, % .15e, % .15e\n", n, x3, err);
    } while (____?_____);
    printf("\n# sqrt(2) = % .15e\n", _______?_______);
    return (0);
}